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A particular radioactive source produces 150 mrad of 2 MeVgamma rays per hour at a distance of 1.0 m.

(a) How long could a person stand at this distance before accumulating an intolerable dose of 1 rem?

(b) Assuming the gamma radiation is emitted uniformly in alldirections, at what distance would a person receive a dose of5 mrad/h from this source?

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